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Digital Logic MCQ - Combinational Circuits

51 For the circuit shown for AB = 00, AB = 01, C, S values respectively are

For the circuit shown for AB = 00, AB = 01, C, S values respectively are

52 What logic gate is represented by the circuit shown below?

What logic gate is represented by the circuit shown below

53 The circuit shown below is the

The circuit shown below is the

54 In the following gate network which gate is redundant?

In the following gate network which gate is redundant

Before Gate No. 4 being removed Output, F= xyz' + w'z + w' After Gate No. 4 being removed, Output, F = xyz' + z = xyz' + z

55 The combinational circuit given below is implemented with two NAND gates. To which of the following individual gates is its equivalent?

The combinational circuit given below is implemented with two NDA gates

[ (a.b) '. (a.b) ' ] '= ((a.b)')' + ((a.b)')' = ( a.b)+ (a.b) =(a.b)

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Question:

What is the minimum number of two-input NAND gates used to perform the function of two input OR gate ?

A. one
B. two
C. three
D. four

Correct answer: C

Explanation:

Y=A+B. This is the equation of OR gate. We require 3 NAND gates to create OR gate. We can also write After 1st NAND operation Y = (A…

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